hnokes,
I immediately noticed the "underdressed" folks in your photos as well. What I find interesting is that based on his comments to you, he brought a suit and tie along with him yet chose not to wear it to formal night or semi-formal night.....I wonder what he was saving the suit for?
That said, I'm glad the staff didn't treat them any differently based on their choice of clothing....hey, for all we know they were staying in one of the disney suites.
To each his own!